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Gravitational Wave (GW) is very small temporal variation of space distortion which is caused from the change of enormous mass such as inspiral and merger of black hole binaries, explosion of supernovae, and the inflation in the early universe. In order to detect GW directly, long-baseline laser interferometers have been developed by many countries and, at long last, the first direct detection of GW...
In Japan, not only the ground-based gravitational wave (GW) detector mission KAGRA but also the space GW detector mission DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) and its milestone mission B-DECIGO have been promoted. The designed strain sensitivity of DECIGO and B-DECIGO are δL/L < 10−23. Since the GW detector requires high power and highly-stable light source, we have...
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